Machine for producing gears



May 15, 1928. 1,669,818

. J. E. GLEASON ET AL MACHINE FOR PRODUCING GEARS Original Filed Sept. 5, 1924 7 Sheets-Sheet Hal INVENTOES.

JAMES E.6,\ EAsoN ERNE T C. HEAD May 15, 1928. 1,669,818

J. E. GLEASON ET AL MACHINE FOR PRODUCING GEARS Original Filed Sept. 5, 1924 7 Sheets-Sheet 2 May 15, 1928.

J. E. GLEASON ET AL MACHINE FOR PRODUCING GEARS Original Filed Sept.5, 1924 7 s t -sh t 3 INVENTORS JAMES EGLEAsoN ERNEST C. HEAD FIG. \0

THEIR ATTOR May 15, 1928. 1,669,818

J. E. GLEASON ET AL.

MACHINE FOR PRODUCING GEARS Original Filed Sept. 5, 1924 7 Sheets-Sheet 4 55 FIG.

4, r Wig INVENTOES M IAMEs E. GLEASON.

ERNEST CHEAD.

B /M m THEIR ATTORNEY May 15, 1928. 1,669,818

J. E. GLEASON ET AL MACHINE FOR rnonucme cams Original Filed Sept. 5, 1924 '7 Sheets-Sheet 5 INVENTOES IAMEsEGLEAsoN ERNEST C, HEAD- THEIR ATToRNEYf May 15, 1928. 1,669,818

J. E. GLEASON ET AL MACHINE FOR PRODUCING GEARS Original Filed Sept. 5, 1924 '7 Sheets-Sheet 6 ll l ill.

INVENTOES JAMES E. GLEASONY ERNEST -HEAD A THE? ATTORN May 15, 1928. 1,669,818

I J. E. GLEASON ETYAL momma FOR PRonucme arms Original Filed Sept. 5, 1924 '7 Sheets-Sheet 7 v mvraw-roas CRMES E. GLEASON. ERNE3T (3. HEAD v BY THEIR ATTORNE Patented May 15, 1928.

UNITED" STATES PATENT OFFIOE.

TA IE8 E. GLEASON AND ERNEST C; HEAD, OI! ROCHESTER, NEW YORK, ABSIGNOBS TO GLEASON WORKS, OF ROCHESTER, NEW YORK, A CORPORATION 01' NEW YORK- mcnmn non. rnomrome calms.

Original applieationflled September; 1924, Serial No. 736,100. .Divided and this application filed Kay 15,

- 4 1825. Serial Ilo. 30,498.

The present invention relates to a machine for producing gears, and relates in particular to a machine adapted to operate upon gears which have previously been cut by what is known-as a generating. process.

One object of the .invention is to provide a machine for treating gears so as to reduce to a minimum such imperfections as may exist on the tooth surfaces of generated gears and also to increase the strength of the teeth. A further object of the invent-ion is to eliminate flats, high spots, tool marks or other irregularities of the tooth surfaces of a gear by rolling a toothed blank with a mast-er gear whose tooth surfaces are formed as perfectas possible, and applying considerable pressure to force the master gear and blank together, so as to roll or press out the imperfections of the tooth surfaces on the blankuntil it exactly conforms to the master gear. a

A further object of the invention is to provide a machine in which a previously generated blank may be rolled under considerable pressure, while cold, with a master gear, and in which are incorporated bearin arranged to receive both the radial and ax'al thrusts, produced by the rolling movement of the master gear and blank under pressure, so as to permit operation of the machine with a minimum of power and so as to equalize the pressure on both faces of the teeth of the blank being rolled. o Other objects will be apparent hereinafter from the specification and from the recitation of the claims. r

With the above and other objects in view, the invention resides in the combination of parts and in the novel elements described in the specification, illustrated in the drawings or set forth in the claims.

In the drawings:

0 Fig. 1 1s a plan View of a machine con structed accordingto one embodiment of this invention, as, arranged for operation upon a bevel ear}; blank; i Fig. 2 is a orizont'al section of the shown in Fig. 1; V Fig. .3 is' a vertical section on the line 3-3 of F ig. 2;

Figs 4 is a transverse sectional view of the machine, showing the master gear and its driving parts in end elevation;

Fig. 5 is adiagrammatic view showing parts blank and master the manner in which the master gear and blank engage during the operation of the machine;-

Fig. 6 is'a plan view showinga modified arrangement of the invention, adapted to operate upon a bevel pinion;

Fig. 7 is a horizontal sectional view, of the machine of Fig. 6, showin the supporting means for the evel pinion;

Fig. 8 is'a vertical sectional view on the line 88 of Fig. 6; r

Fig. 9 is a vertical sectional view on the line 9-9 of Fig. 7 and Fig. 10 is a horizontal the line 10-10 of Fig. 8.

The tooth surfaces. of gears produced in a cutting operation are not alw'aysnuflicient- 1y smooth to meet present day requirements as to quietness of operation. Grindin has been more and more resorted to,'in order to secure the desired finish. Grinding the gears is, however, oftentimes more expensive than circumstances warrant particularly because of the time required in the operation. We have discovered that if the cut gears are rolled, beforehardening, with a master gear, under a considerable pressure, the imper fections of the out surfaces will be rolled out and gears will be produced having the desired tooth surface finish. This operation requiresmuch less time and is less expensive than grinding. The present invention ha s for its purpose the provision of a maparticularly sectional view on c inefor rolling a previously generated I blank with a master gear under the required pressure, with the object of imparting to the tooth surfaces of the cut gear a very smooth finish.

This application is a division of.our application, erial No. 736,100, filed September 5, 1524,;for a method of producing gear teet Referring first to Figs. 1 to 5, 5 designates a table upon which the blank spindle 6 is journaled. This table 5 is angularly adjustable on a base 7 to, permit positioning of the gear to the proper pitch angle adjustment. The base 7 is horizontally adjustable on the bed or frame 8 of the machine to permit adjustment of the blank spindle 6 in a direction at right angles to the axis of themaster gear so as to insure a proper pressure-angle upon the rolled blank. Adjustment of the table '5 may be effected 20 r ever, is so great as to generate a tremendous in any'desired' manner,as-is well known in the'art, and the table may .be fastened dn any adjusted position by the bolts 9 which en age in the ways 10 formed on the base 7 A justment of the base 7 is effected by means of the. screw 11 w ich engages a nut 12 carried by the base. e bolts 13 serve to retain the base in any adjusted POSltlOIl.

The blank-spindle 6, as previously stated,

is journaled in-the table 5 and is provided with a head-14 on which is mounted a ring v 15 to which the blank B secured, being clamped against the ring 15 by means of the plate 16.

- One feature of this invention is that the blank and master gear are so engaged under. pressure that the blank can be correctly and positivelydriven by its engagement with the master gear. The pressure that is. efiected between the master gear and the blank, howfriction. lnthepractical operation of the machine this friction is largely eliminated,

' while at the same time the positive drive be- .set upby the-jgpressure of the master gear againstthe' blank, and reduce the friction.

; which. are set an by "With the structure desen or. loads on :theblank-yspindlelare received? I by the roller bearingsimlorthehall bearings} V -.48 on the screw ,Myengages a collar48' that v isjfixed to the support 25,. thus withdrawing; 11m nill-ppol't and'masterigear away the .f' In order to make the machine as rigid as ipossible, and to distribute the strains evenly, 1

a dle'canbelreadilyjufrned.

tween the master gear and. blank is main-,

tained, without requiring timing gears, by the use bf radial and axial'thrust' bearings. Thefnipright portion 17 of the table 5 is provide with an end face 18, arranged opposite to the head 14, and terminating in an angular extension 19 which has .a dust proof connection with the head. Between the face 18 and the head 14arearra d anti-friction bearings 20 of an Jsuitable orm, carried by s. suitable retaining ring 21"'ournaled on the-blank spindles: Th J arings receive blank spindle the end .or axflialthrust of the created by such-1 endthrust so that yery-little be operatediwith a ofall'that is required, Arranged within: the ho or upright portion 17 ofthei table 5, iii surrounding the spindle 6 are othenbearings22arranged within suitable; ca esj23.,and

ceive the radial t lfo ffitlie spindle 6 between the gear blank anthithekmaster' 22 sothat the blenk anttits imum and insures maintaining agwiioper and accurate relationshi between these blank and master gearwit out backlash.

.The master gear M is mounted onFa spin-2 dle. 24 3o'urnaled in can port or housing:25,

which ncludes the'end Y endthe dust I plate 27. The master gear,l;i8sociredto to re-- a blank B, during.-

:i upr rti s r n ucesfir'ietioni to a the master gear spindle 24 are ball bearings i which serve to take up radial thrusts of the spindle.

In the operation of the machine, the master ear will beforced into enga einent with the lank and will be rotated w ile in such engagement, the blank being also rotated be-' cause. of its engagement with themaster ar. The master gear spindle 24 may be rivenin any suitable manner. As shown, the s indie head 28 has secured to it a worm whee 31 which is rotated by a worm 32 mountedon the shaft 33 which is rotated by the pulley 34 from any suitable source of power. k

The master gear is moved longitudinally of the spindle 24 to force it. into engagement with the blank. For the purpose of guiding the master gear spindle in its longitudinal. 7

movement, the housing 25 is provided withan overhanging portion35, which is movable on the guide way 36. formed on theupper end of the vertical portion 37 of the 1 frame orbed 8, andwith 'anex'tension 38.

' which slides on the uide surface 39 of said upright portion 37.

orlugs 40 and 41 serve to retainthe housing. no

movable guide plates 25 on the upright 37.

The endwise or longitudinal movement,

"er, under necessary to force the master the gear 'ressure into e' agement wit blank is accompli t fi ed in the following man-i her. 42 designates a cylinder-provided onthe housing 25 and 43 a piston movable saidcylinder. The piston 43. is actuated by a screw 44 which turns in a stationary nut 45,

fixed in the upright 37::and which is provided at its outerend; with an ope 'handwheel 46. Byturning' the hand Wil :5

46 and the screw ii-the iston 43 serves three hthefiuid 4 inthe cylinder 42 to orce the housing'25 and the spindle'24 u R g .rolling operation, so as movethe master ear. into the desired ens agag ment withithe b anlr. l To withdraw the I master gear, the hand wheel 46 is turned in. w I

with the mastert-geari M toward the gear thef'opposite direction whereupon a shoulder the base? is provided witha yertical or 1 standard :4 9.":ftl ;'hic h risiadjnsta and ter gear and blank.

From the preceding description, it will be seen that the axial bearings 20' and 29 have been so arranged behind the blank head 14 and the master gear head 28, respectively, as to reduce the friction resisting the'turning of the gears because of the great pressure under which they are engaged, and at the same time form a rigid backing to fully'take up end thrusts on the gears, while the radial bearings 22 and are so'positioned, respectively, as to offset any frictional resistance to the rotation of the'blank and master gear spindles in their respective supports. By employing these two types of bearings, then, the total frictional resistance to the turning of the gears is so reduced that, despite the great pressure under which theyare engaged, the two gears will 'rotate freely on.their' axes and the master gear will drive the blank positively and at the proper. rate. By this construction, the machine may be operated with a minimum f power and at the same time, the use of timing gears, which might otherwise be required to maintain a fixed velocity ratio between master gear and blank, is

obviated. It will be'understood, of course, that we do not desire to be limited to the particular construction shown, as the anti- 'f1iction bearings may be of any suitable type" and may be .locatedin other positions so long as the desired eifect described above is obtained.

In Figs. 6 to 10 is illustrated an embodiment of this invention, in which-mechanism is provided for rolling a bevel pinion. P

designates the pinion blank which is rolled between two master gears 60 and 61..- Preferably, the support for the master gear 60 is stationary, while provision is made for moving 'themaster gear 61 and the'pinion P bodily toward the master gearv 60, so

as to rollthe pinion under considerable pressure between the two master gears. The

supporting and operating parts for the master gear 61 are the same as those alreaiii' described with respect to the master gear The table 5 and housing 17 may be employed .to support the second master gear in the manner described with reference to the gear blank B, the'table 5 being adjusted on the base 7 -to'=a position-in line with the positionof the master gear 61, as shown. The pinion blank P is mounted on a spindle which is journaled within a support 62 that is slidable on the stationary frame 63 which may be secured to the bed or frame 8, intermediate the table .5 and housing 25, as

port toward the master gear 60.

In order to reduce the friction set up by the pressure exerted by the pinion rotation under pressure, the pinion blank P is mounted on a spindle 70 which is provided with anti-friction radial thrust bearings 71 and anti-friction axial thrust bearings 72 to receive the radial and axial thrusts respectively. The master gear supports, as al ready described, are, also, provided with radial and axial anti-frictionthrust bearings. Through the use of theseanti-friction bearings, the master gears and pinion blank can be rolled together with the employment, of a minimum of power and without'the use of timing gears to maintaining a proper velocity ratio. In order to permit the necessary adjustment of the pinion blank to bring its teeth to the proper position with ref erence to the master gears 60 and 61, the spindle 70 is mounted in an eccentric sleeve 73. By turning this sleeve the required adjustment of the blank may be obtained so as to insure .a proper pressure angle on the teeth after rolling.

ing rolling, by turning the hand wheel 46. This pressure will vary from two to fifteen tons in ordinary practice. Where the blank teeth are overs ze, rolling is continued and and force the latter together with its supadditional pressure applied in successive operation until the master gear and blank are at the proper depth of enga ement or preferably until their pitch sur aces contact. When this point of engagement is reached, the blank will have been reduced to the size and shape of the master "gear which is then withdrawn.

Preferably the o eration is performed on a blank which is rst cut by a generating process, although the blank may be formed in some other manner, and the blank is rolled with the master gear while cold. After the cold rolling operation is com pl'eted the blank is casehardened and ready for use. The master gear is made as nearly perfect as ssible". Preferably the blank to be operate upon in the machine of this invention is made with teeth slightly thicker than required for the finished product;

additional thickness which may be from two to five thousandths of an inch is rolled oil by the master gear, thus eliminating imperfections or irregularities of the tooth surfaces of the blank, causing the blank toconform tothe master gear, and strengthening the teeth of the blank so that they will retain their shape and be less distorted during the hardening operation.

While we have described a mechanism in which power is appliedto the master gear, e ually 'efiicientl results can be had by app ying the power/to the blank and either master gear or blank may be forced into engagement one with theother,

WVhile we have described our invention with particular reference to the production master gear and cable to the 'and as fall within, the

respectively held, supports for the s V including end faces 01) osite to the ,ing one only-of sai sphind of bevel gears, and particularly to the pro- 'duction of. bevel gears having longitudinally curved teeth,[it will be understoodthat, with suitable modifications, it is equally ap liproduction of spur and ot 181 types ofgears/ I j 1 While, we have described particular embodiments of our invention, it is to be understood that the invention iscapable of various further modifications without do parting from its intent, and.that this application is intended to cover any adaptations' or embodiments, following, in general, the principles of the invention and including such departures from thepresent disclosure.

spindles being arranged in angular relation permit rolling of the master. gear with "the bevel blank, heads on the,

against vwhich the blank and maste'r gear a'lfe the spindles, anti-friction axial bearings ranged between said end facesand headsin.

order to reduce the friction" set upby'endwise thrust of the s] indles meansior rotati tqe ec ol y through the" intermes ing engag'ementjof blank a rotational. move:

ment of each; sp1ndle, to roll the mastergearf and blank together, and means for effecting a considerable relative pressure between;

till

raction. v

The combination with a spindle'adaptsulpportfor oneof saidspmdles, instrumentai master gear and blank during said rolling v 2. ed to support a bevel gear blank, of a second a 3 indie for supporting a master gear said sgindles being" arranged in angular relation- 1 inder, a relatively movable liquid medium; interposed in t e. path of the be applied to terposed inthe patli of.tlie-pistonflandper- ,mitting considerable 3 yieldabilit to permit rolling of the-master gear with the blank, heads -on the spindles against which the blank and master gear are respectively held, supports for the spindles including endgtaces opposite to the heads on the spindles, anti-friction axial bearings arranged between said end faces and heads in order to reduce the friction set up by endwise thrust of the spindles, andradial bearings co operating with saidspindles antia friction acting to reduce the friction set up by the radial thrust of the spindles, means for imparting a relative rotational movement between said spindles, tlie velocity of which is controlled solely by the intermeshing engagement of master gear and blank and means for effecting a considerable relative pressure between master gear and blank I during said rolling motion.

3. The combination with a spindle adapt- .ed to support a gear blank, ofa second spindie for supporting a master gear adapted to.

haverolling engagement with the blank, in-

stru'mentalities for efiecting considerable relative pressure-between themaster gear and blank comprising amovable support. for one of said spindles, pressure. means connected with said support consisting-of a cyliston, and a iston and permitting considerable pressure with: slight yieldability -between the master gear and blank, V

4. The combination with a spindle adapted to supports gear blank,'of a second spindlefor supporting a master gear adapted to have rolling engagement withthe blank,

.. eans for rotating .onebnlygof said spindles.

to effect solely through the intermeshlng en- 5 agement of master gear and blank a rotational movement of each spindle, to roll the.

master gear and blank together, instrumentalities for efiecting considerable relative pressure between the master gear and blank comprising amovable supportfor one .of

said spindles, pressure'ineans connec with said support consisting ofa -cylinder, .arelatively movable pistom a liquid in-' 5. he combination ed; 5. f r supporting a b agea nks 0" anti-friction; radial bearings tor second spindle arranged'at an angle {to the first mentimed Spindle f r; s pp rter a.

- master gear having rolling engagement with the blank, anti friction radial and.- axial bearings for the spindles, means for-efiecting considerable relative pressure",between the master -gear'and blank .com rising a 'movable V tiesfor-actuatin the support consisting of a relatively mova lefcyli'n er and piston,

and a liquid medium in the path of the piston permitting considerable pressure between the master gear and blank with slight yieldability.

6. The combination with a spindle for supporting a master gear, of a spindle for supporting a gear blank, meanstor adjusting saidspindles relatively to each other to engage the master gear and blank under Considerable relative pressure, means for imparting a relative rotational movement between said spindles, the velocity of which is controlled solely by the intcrmeshing engagement of blank and master gear under pressure and anti-friction bearings for absorbing the thrusts and reducing the friction set up by the relative rotational movement.

7. The combination with a spindle for supporting a master gear, of a second spindle arranged at an angle thereto and adapted to support a tapered gear blank, means for adjusting one of said spindles bodily to offsetthe axis of the gear carried thereby relatively to the axis of the gear carried by the other spindle, means for adjusting said spindles relatively to each other to engage said master gear and blank under a considerable relative pressure and .means for rotating said spindles to roll said master gear and blank in engagement under pressure.

8. The combination with a spindle for supporting a master gear, of a second spindle arranged at an angle thereto and adapt-' ed to support a tapered gear blank, means for adjusting one of said spindles bodily to oifset the axis of the gear carried thereby relatively to the axis of the gear carried by the other spindle, means for adjusting one of said spindles bodily to move the gear carried thereby in a direction substantially at right angles to the axis of the'otherspindle,

means for adjusting said spindles relatively to each other to engage said master gear and blank under a considerable relative pressure and means for rotatin said spindles to roll master gear andbla I under pressure. 1 v

9. The combination with a master gear, of a pinion having rollin engagement with said master gear, a spin le for the pinion, a

, support for the spindle movable toward said master gear, a second master gear having rolling engagement with the pinion and 'arrange opposite to the first mentioned master gear, means for moving the second master gear and pinion toward the first named master gearto engage all of said gears under considerable pressure and means for r'otating said gears togeth'erunder pressure.

10. The combination with a spindle for supporting a master gear, of a spindle for supiportin a pinion, means for positioning sai intermeshing engagement of the master gear and pinion, a support for the pinion spindle in engagement,

spindles. 1n angular relation to permit movable toward said master gear, a third spindle adapted to support a second master gear for rolling engagement with the pinion, a support for said last named spindle movable toward said first master gear, means for moving the second master gear spindle and pinion spindle towards the first named master gear to engage all of said gears under considerable pressure, means for rotating one only of said spindles to effect solely through the intermeshing engagement of master gears and pinion a rotation of all of said spindles, and anti-friction bearings for the pinion and master gear spindles.

11. In a machine of the class described, a master gear, means .for meshing a previously generated cold blank and a master gear under-considerable pressure, means for'efl'ectsorbing the thrusts and reducing the friction set up by such rolling engagement.

12. In a machine for producing gears, the combination with a spindle adapted to support a gear'blank having teeth previously cut therein slightly thicker than required in the final gear, of a'second spindle for supporting a master gear, means for rotating the two spindles to roll the blank while cold and the. master gear together, and means for exerting a high pressure on said master gear and blank during said rolling movement to force the teeth of one member toward the bottom of the tooth spaces of the. other member.

i 13. In a machine for producing gears, the

combination with a spindle adapted to sup' gear by the inter-engagementof master gearv and blank, means for moving one of said supports toward the other for exerting a hlgh pressure upon said master gear and l blank during said rolling movement to force the teeth of one member toward the bottom of the tooth spaces of the other member, and anti-friction bearings disposed between said spindles and their respective supports for reducing the friction set up by the rolling engagement of blank and master gear under pressure.

14. In a machine for producing gears,'the

combination with a spindle adapted for supporting a tapered gear blank having teeth gear, means for il'npartmg rotary movement to said spindles to roll the blank while cold with said master gear, means for eflecting a hi h pressure between said master gear ment under pressure.

- and lank during their rolling engagement,

and anti-friction radial and axial thrust bearingsfor both said spindles for reduc ng the friction set up by such rolling engage- 15. In a machine for producing ears, the combination with a spindle adapte to support a tapered gear blank having teeth previously cut, therein, of a second spindle arranged at on angle to the first named spindle and adapted to support a master gear, means for driving one onl of said spindles to 'roll the blank while co (1 with said master "gear by the inter-engagement of master gear and blank, means for effecting a-high pressure between the master gearand blank during their rolling inter-engagement, and antifriction radial and axial thrust bearin s for both said spindles for reducing the friction set up by such rolling engagement under pressure. Y

16. In a machine for producing gears, the combination with a spindle adapted to support a tapered gear blank, of a second spindle arranged at an an Is to. the first named spindle and ,ada te to supports master gear, means for a justmg one of sald.

spindles'bodily in a directionsubstantially at right angles to the axis of the other spindle, means for imparting rotary movement to said spindles to roll said master gear and blank together, means for'efi'ecting a high pressure between the master. gear and blank during their rolling inter-engagement,

I add anti-friction radial and axial thrust bearin s for both said spindles for reducing the friction set up by such rolling engagement under pressure. A I 17. In a machine for producing gears, the combination with a spindle adapted to support a tapered gear blank, of a second spindle arranged at an angle to the first spindle and adapted tosupports master gear, means for adjusting one of said spindles bodily to ofiset the axisof the mgm -ber carried thereby relative, to the axis of .the friction setup by such port a tapered gearblank, -'of a second i spindle arranged at an angle to the first named spindle and adapted to support a master gear, means for adjusting one of said spindles bodlly in a direction substantially during their rolling inter-engagement, and

member carried thereby relative to the axis 1 of the member barried by the other spindle, means for imparting rotary movement to saidspindles rollthe blank and master gear together, means for efiecting a h1gh pressure between the master gear and blank anti-friction radial and axial thrust bearings for both of said spindles for reducing the friction set up by their rolling engagement under ressure. by

19. a machine for producing gears, the combination with a spindle adapted to sup-; port a tapered gear b ank having'teeth previous] cut therein, of a secondspindle arrange at an angle to the first named spindle and adapted to support a master gear, means-for adjusting one of said spindles bodily in a direction substantially at right angles to the axis of; the other spindle, means for driving one only of said spindles to roll the master gear and blank while cold together by their inter-engagement, means for efiectinga highpressure between the master gear and blank during their rolling interengagement, and anti-friction radial and axial thrust bearin' for both said spindles for reducing the friction set up by such rolling engagement under pressure.

20. n a machine for producing gears, the combination with a spindle adapted. to support atapered gear blank having teeth preyiousl cut therein, of a second spindle arrange at an angle to the firstnamed spindle and ads ted to support a mastergear, means for justing one of said spindles bodily to ofl'set the axis of the member carried thereb relative to the axis offthe member garrie by the other spindle, means for driving one only of sai spindles to roll the blank while cold with sand master gear sole.-

ly by the, inter-engagement of master gear and blank, means or effecting a high' pressure between the master gear and blank durfIICtlOH" radial and axial thrust bearin s for both saidspindles for reducingthe friction set up by such rolling engagement under pressure.

21-. In a machine for producing gears, the

combination with a spindle adapted to support a tapered gear b ank having teeth previousl cut therein, of a second spindle arrange at an angle, to the first named spindle and adapted to support a master gear,

means foradjusting one of said spindles bodily in a direction substantially at right angles to the axis of theother spindle,,means for adjusting one-of said spindles bodily to ofiset the axis of the member carried 'there by relative to the axis of the member carried by the other spindle, means for driving one in their rolling inter-engagement and anti-' only of said spindles to roll the blank while cold with said master gear solely by the inter-engagement of the master gear and blank, means for eflecting a high pressure between the master gear and blank. during their rolling inter-engagement, .and antifriction radial and axial thrust bearings for both said spindles for reducing the friction set up by such rolling engagement under pressure. e

22. In a machine for producing gears, the combination with a spindle adapted to support a tapered pinion blank having teeth previously cut therein, of a second spindle arranged at an angle to the first named spindle and adapted to supporta master gear, a third spindle adapted to support a second master gear, also arranged at an angle to the first named spindle, a movable support for one of said spindles, means for imparting rotary movement to said spindles to roll said pinion blank while cold with said mas- (ter gears, means for moving said support to force the teeth of the master gears towards the bottoms of the tooth spaces of the blank and exert a high pressure upon said gears and blank during rolling and anti-friction bearings for each of said spindles to reduce the friction set up by their rolling engagement under pressure.

23. In a machine for producing gears, the combination with a spindle adapted to support a tapered pinion blank having teeth previously cut therein, of a second spindle arranged at an angle to the first named spindle and adapted to support a master gear, a third spindle arranged at an angle to the first namedspindle and adapted to support a. second master gear, a movable support for one of said spindles, means for rotating one only of said, spindles to roll said pinion blank while cold with the master gears solely by the inter-engagement of the master gears and pinion blank, means for moving said support to force the teeth of the master, gears toward the bottoms of the tooth spaces of the blank and to exert a high pressure upon said gears and blank during rolling, and anti-friction bearings for each of said spindles for reducing the frictionset up by the rolling engagement of master gears and blank under pressure.

24. In a machinefor producing gears, a

vbase, an, upright secured to said base, a'support slidable on said upright, a spindle journaled in said support, a carrier slidably adjustable on said base for adjustment in a direction at right angles to theaxis of the first spindle, a second spindle, one of said having teeth previously cut therein and the spindles being adapted to support .a blank other of said spindles being adapted to support a master gear, a support in which the second spindle is journaled, said support being angularly. adjustablepn said carrier. to

high pressure upon said master gears and blank during rolling, anti-friction radial and axial thrust bearings for both of said .1

spindles and a bracing member connecting sald carrier and upright.

25. In a machine for producing gears, a

base, an upright secured to said base, a sup: port slidable on said upright, a spindle jcurnaled in said support, a carrier slidably adjustable on said base for adjustment in a direction at right angles to the axis of the R0- lirst spindle, a second spindle, one of said spindles being adapted to support a gear blank having teeth previously cut therein and the other of said spindles being adapted to support a master gear, a support in which as the second spindle is journaled, said support being angularly adjustable on said carrier to position said second spindlev at an angle to the first named spindle, means for rotating one only of said spindles to roll the master gear and blank together solely by their interengagement, means for moving the first named support to, exert a high pressure on the master gear and blank during rolling, anti-friction radial and axial thrust bearings for said 05 spindles, and a bracing member connecting said carrier and upright.

26. In a machine for producing gears, a base, an upright secured to said base, a support slidable on said upright, a spindle jour- 10o naled in said support, a carrier slidably adjustable on said base for adjustment in a direction at right angles to the axis of the first spindle, a second spindle, one of said spindles being adapted to support a gear blank and the other of said spindles being adapted to support a master gear, a support in which the second spindle is journaled, said sup-V port being angularly adjustable on said carrier to position said second spindle at an no angle to the first named spindle, means for adjusting one of said spindles bodily on its support to offset the axis of the member carried thereby relative to the axis of the member carried by the other spindle, means for imparting rotary motion to said spindles to roll the master gear and blank together, mean for moving the first named support to exert a high pressure on said master gear and blank during rolling, anti-friction radial and axial thrust bearings for said spindles, and a bracing member connecting said carrier and upright.

27. In a machine for producing gears, a

base, an upright secured to said base, a support slidable on said upright, a rotatable spindle mounted on said support, a carrier slidably adjustable on said base for adjustment in a direction at right angles to the axis of the first spindle,,a second spindle, one no of said spindles being adapted to support a gear blank and the other of said spindles besaid supports in which one of said splndles is journaled, said sleeve being adjustable to offset the axes of master gear and blank relatively to each other, means for imparting rotary motion to said s indles, means for moving said first name support to exert a high pressure on said master gear and blank during rolling, and anti-friction radial and a base, ail-upright secured to said base, a-sup .port slidable on said upright, a rotatable axial thrust bearings for said spindles.

28. In a machine-for producing gears, a

spindle mounted on said support, a carrier slidably adjustable on said base for adjustment in'a direction at'right angles to the axis of said spindle, a second spindle, one of said spindles being adapted. to support a gear blank and the other of'said spindles being adapted to support a master r, a support in which'said second spind e is mounted, said support being angularl adjustable on said carrier to position sai second spindle at an angle to the first named spindle, an eccentric sleeve carried by one of said supports in which one of said spindles is jourthe'axes'of blank and master gear relatively to each other, means for imparting rotary motion to said spindles, means for movi the first named support to force the teeth 0 the master gear towardsvthe bottom. of the tooth spaces of the blank and to exert a high pressure on said master gear and blank during rolling, anti-friction radial and thrust bearings for each of said spindles, and a bracing member connecting said carrier and upright.

In witness whereof, we have hereunto signed our names.

JAMES E. GLEASON. Banner 0. HEAD.

naled, said sleeve being adjustable to offset 

